Device for graining zincographic and like plates



"(N-o Model). Y 3Sheets'-Sheet'2. A G'. N. MORRIS.

Device"fo'f'rainin'g Zinoogra'p'hm and like. Pla-tels. No. "236;824.- Patented Jan. 18,1881.l

Fig. 2.

. .Dlvioefor @rainingZinoogaphic 'and like Pla-tes. kN. 236,824. Patented Jana. 18'Q1881.

ETERS. PHOTO-LITHOGRAFH. WASHINGTON. D C

' STAT-Es CHARLES N. MORRIS, OF CINCINNATI, OHIO.

DEVICE FOR GRAINING ZINCOGRAPHIC AND LIKE PLATES.

SPECIFICATION formingpart of Letters PatentV No. 236,824, dated January 18, 1881. Application filed September 17,1880. (No model.)

To all whom it may concern:

Be it known: that I, CHARLES N. MORRIS, of Cincinnati, in the county of Hamilton and State of Ohio,`have invented a new and useful Device for .Grainin g Zincographic and like Plates, of which the following is a specificatlOll. 1

My invention relates to mechanism for producin g the proper grain or plain granular surface' upon. a zinc or otherplate or slab to adapt it to receive a crayon or pen drawing for printing purposes,fby they action, in conjunction with any suitable abradant, of rollers automatically rotated.

The deviceemployed by me for the purpose y consists of two or more rollers, preferably of conical shape, and of some heavy and moderately-hard material, and so jonrnaled upon a horizontally-whirling axle as for their periphe'ries to resttangentially upon the surface to be operated upon. The said axle has a vertical shank so conned inthe lower end of a vertically-slotted driver as, while being revolved thereby in a`plane parallel to the face of the work, to be at liberty to rise and fall freely, so as to ,secure uniform action on all portions of the plate or slab undergoing operation. i

In order that my invention may be fully un derstood, I will proceed to describe it with reference to the accompanying drawings, in Which- Figure 1 is a perspective .view of a grainingmachine embodying my invention. Fig. 2 representsa pair of my conical graining-rollers, half in axial section and-half in elevation. Fig. 3 showsm y driver in side elevation. Figs. 4 and 5 represent modifications of my invention, in which the grainin g -rollers are of cylindrical form and are journaled upon a straight axle.

A represents the frame of a machine whose construction (with the exception of the driver and the grinning-rollers) may be substantially that of an ordinary en gravers routing or sandpapering-machine, B being the usual vertically-adjustable table of such a machine; C, the standard, supporting the customary folding'crane D, having the usual vertical mandrel F, driven by steam or other power, and the represented unusually long guidin g-handle E, having about twice the radial sweep of the mandrel-frame.

Firmly attached to the lower extremity of mandrel F, by a screw, g, or other means, is my driver G, whose lower end has a vertical notch or slot, g', to receive a shank or stem, H, that extends upward from a bent axle or studshaft, I. Both slot g and stem H are bounded by flat and vertically-parallel walls, so as to compel corotation ofdriver and stem, and thus produce the desired horizontal swing or whirl of the rollers, while permitting said rollers to follow to any desired extent the inequalities or lack of horizontality of plate-surface. The upper extremity, g, of the driver has the represented cupform, to retain any grease that may reach that part.

Collars i hold the axle to its proper longitudinal position in the driver, and other collars, i', coact with nuts L upon the screw-threaded extremities'i" of the axle, so as to hold the rollers in place upon the axle, while permitting their free rotation thereupon. The rollers proper, K, are preferably of zinc, and are cast solidly upon cast-iron or brass hubs M. Washers N, ot any suitable material, are interposed between the hub ends and the said nuts and collars. The hubs M are chambered out, as at m, with the double object of diminishing friction and of serving as retaining-chambers orV reservoirs for anylubricant without danger of its spillage upon the work, or for reception of a greased sleeve or packing.

The pitch ofthe screws t at the extremities of the bent axle is necessarily in opposite direction to that of the screw g by which the driver is attached to the mandrel, in order that the operation of the machine shall tend rather to tighten than to loosen the said screws. In the present illustration the screw-threads are arranged for a left-hand revolution of the rollers, the pitch of the driver-coupling being with this intent left-handed, while the axlethreads are right-handed.

In operation the plate Z to be surfaced is secured upon the table B, and, a suitable abradant-such as tine sand, emery-iour, or other hard angular and gritty powder-being scattered upon the plate, the rollers are secured in the driver, and the table is adjusted to proper height. The operator then grasps the handle posedofagangofindependently-revolviugcylinders upon a straight axle, as represented in Fig. 4,and these component cylinders may increase in longitudinal dimensions toward the outer extremities of the axle, as in Fig. 5.

In place of or in conjunction with the use of an abrad ant upon the plate, the operatic g-faces of the rollers maybe com posed of an abrading material,

Instead of zinc I may employ glass, stone, or other suitable material for the rollers.

The rollers proper, especially when of so dit ferent a material to that of the axle as glass, may journal solidly upon the axle-arms, as shown in Fig. 4, and a dry lubricant, suchas plumbago, be employed, or lubricants be dispensed with.

The pressure of' thegraining-rollers may, if desired, be increased or regulated by weights or a spring bearing upon thetop of the axlestem. n n

While preferring two rollers, as here illustrated, a greater number maybe employed. For example, three or four radial arms for an equal number of rollers may be employed, and

the alternate rollers may be of diverse diameters and radial sweepand with independent play or self-adjustment upon the plat-e.

I have used and preferfor the material of the washers bacon-rind cnt into suitable anposed of metal or other suitable material.

An obvious modification consists in forming the driver with a square or at tenen, which occupies, with sufficient play in the plane of selfadjustment, a corresponding-mortise or dependently hinged to the driver.

The rollers may be cast solidly upon their socket in the axle, or each axle-arm may be inshafts,saidshafts being journaledin the swing in g bar.

The mandrel-frame may be a stationary one, and the lateral shift or travel besecured by moving the table.

I am aware that rollers, both conical and otherwise, have been journaled in swinging frames for various uses in the arts and that folding cranes or mandrel-frames have been employed for journal-bearings of routing-bits,

zc. l thereforedisclaim noveltyin such roll ersand bearingfframes, separately considered.

Having thus described my invention, the

following is what Iclaim as new and desire to secure by Letters Patent:

The zincographic-graining apparatus, consisting of balanced rollersK upona swinging shaft,1, whose stem H oceupiesvertical slot gf in the driver or mandrel G, so as, while compelling corotation, to permit vertical play of the rollers, in the described combination with folding cranebearing D of said mandrel, provided with guiding-handle E under control of the operator, as set forth.

In testimony of which invention I hereunto set inyhand.

, oHAs. N. MORRIS.

Attest GEO. H. KNIGHT, PERCY KNIGHT. 

